Posted by **Anonymous** on Sunday, November 7, 2010 at 1:27pm.

Volunteers who had developed a cold within the previous 24 hours were randomized to take either zinc or placebo lozenges every 2 to 3 hours until their cold symptoms were gone. Twenty-five participants took zinc lozenges, and 23 participants took placebo lozenges. The mean overall duration of symptoms for the zinc lozenge group was x1 = 4.4 days, and the standard deviation of overall duration of symptoms was 1.6 days. For the placebo group, the mean overall duration of symptoms was x2 = 8.1 days, and the standard deviation was 1.5 days. Compute a 95% confidence interval for the difference in mean days of overall symptoms for the placebo and zinc lozenge treatments. Use the unpooled standard error and use the smaller of n1 - 1 and n2 - 1 as a conservative estimate of degrees of freedom. (Round the answers to one decimal place.)

3 to 4 days

- math -
**tom**, Monday, November 30, 2015 at 3:24pm
yes

## Answer This Question

## Related Questions

- math - collected for use in the approval process required by the U.S. Food and ...
- math - collected for use in the approval process required by the U.S. Food and ...
- Math - In the tests of a new pharmaceutical product, data was collected for use ...
- Math - In the tests of a new pharmaceutical product, data were collected for use...
- geometry - In the tests of a new pharmaceutical product, data were collected for...
- English - Posted by rfvv on Thursday, December 9, 2010 at 11:58pm. Posted by ...
- chemistry ap - Zinc reacts with 18.0 mL of 6.00 M cold, aqueous sulfuric acid ...
- Chemistry - Zinc has three major and two minor isotopes. For this problem, ...
- English - Posted by rfvv on Thursday, December 9, 2010 at 10:03pm. 1. We had to ...
- English - 1. I made up my mind to go there. 2. I decided to go there. 3. I ...

More Related Questions